Reamer



Feb. 6, 1940. G. G. HARRINGTON 2,189,029

REAMER Filed Dec. 6, 1938 Patented Feb. 6,

UNITED STATES REAMER GeorgeG. Harrington, Houston, Tex.', assignor to Reed Roller Bit Company, Houston,-'1ex., a

fcorporation of Texas Application December s, 1938, Serial No. 244,140 12 Claims. (01. 255-73) This invention relatestoreamers for use in -"drilling wells or the like and has for its general object the provision of a means for firmly and se- 'curely, yet detachably, mounting a reamer cutter in a reamer body.

' In mounting reamer cutters it is necessary that they be mounted firmly on the reamer body and that there be no possibility of play between any of the parts constituting the mounting during theoperation of the reamer.

It is, therefore, an object of this invention. to provide a structure for mounting a reamer cutter in a recess in theside of a reamer body in such a manner as to give the greatest possible degree of rigidity. to the mounting, prevent any lost mo- .tion between the parts of the mounting during operation and at the same time utilize the smallest number of parts and eliminate any parts which might be broken or distorted.

vide a reamer mounting; the structure of which is such that the reamer cutter may be removed and replaced with a minimum of effort, without necessity for any special skill and without necessity for any special or extraordinarytools.

Another object of this invention is to provide a reamer mountingythe structure of which is such that the reamer maybe mounted and dismounted without the use of any tools other than those customarily employed in the drilling of wells.

Another object of this invention is to provide a structure in which the reamer cutter may be rotatably mounted upon 'a. support and provided with the proper clearance in the factory under the supervision of skilled workmen, and that thereafter the reamer cutter assembly thus provided, including the cutter and its mounting, may be readily secured on or removed from'a reamer body in use in the field.

Another object of this invention is to provide retaining means for a reamer cutting assembly for retaining it on a reamer body, which retaining means may be of great strength and yet capable .of being placed about the body Withoutnecessity for passing it over the end of the body. v

Another object of this invention is to provide a reamer body with cutter assembly retaining means, which means will not project radially av substantial distance beyond the regular contour of the reamer body. a v Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawing, it being understood that'the same are by Way o i ustration and e m le on I reamer body shown in Fig. 1.

' the line 66 of Fig. 1.

It is a further object of this invention to pro-.

cesses at the opposite ends thereof.

In the drawing: 1 Fig. l is a side elevation of a reamer body cone structed in accordance with-this invention having reamer cutters mounted thereon. f

Fig. '21s a longitudinal cross section through one of the cutters and through a part ofl the Fig. .3 is a transversecrosssection taken along the line 3+3 of Fig. 1. f a

Fig. 4 is a transverse cross section taken along lo the line 4-4 of Fig. l. v

Fig. 5 is a transverse cross section taken along the line 5-5 of Fig.1. I v I Fig. 6 is a transverse cross section taken along 7,

In accordance with this invention the reamer body I is provided with a pluralityof major rece'ss'es 2 adapted to' -receive reamer cutters 3 of the roller type. In the lower ends or each of these-major recesses 2 is an auxiliary recess '4 and at the upper end a second auxiliary recess 5. These auxiliary recesses open into the majorre- Secured about thereamer body I and partly overlying the lower auxiliary recesses 4 is a split 25' ring formed in two major semi-circular-parts 6 vand T welded together at their ends as shown at 8,- and a pair of minor semi-circular parts 9 and I0 surrounding the parts 6 and l and disposed in a circumferential channel in those parts and 30 welded together at H. The major parts 6 and 1 1 are substantially the same outer diameter as the body I of the reamer'and are welded along their edgesto this body as shown at I2. The minor parts 9 and ID are likewise of substantially the. s'ame'outer diameter as'the adjacent outer diameter of the major parts 6 and I and are welded thereto along their opposite edges as at I3; .It will be'seen that the arrangement justdescribed provides in each of the auxiliary recesses 4 a. socket and by virtue of a tapering of the inner surface of the-:major parts 6 and. l where they .overlie these sockets as shown at l4, the sockets are each tapered toward a smaller radial dimension in a directionv away from the major ;re1cess.., v The auxiliary recesses 5 are similar'tothe recesses 4 but do not have overlying thema per- 'manently secured ring such as the one which has been described as overlying the recess l. .Instead, there is a ring similarly formed of. two.

major parts l5 and i6 welded together-at their ends, as shown atl'l, and two minor parts It and I9 welded together at their ends; as shown at.20. The minor parts are countersunk intothe outer Surfaces 9i th m ie Pa is il he s me manne as in the previously described ring and are welded to the major parts along their opposite edges 2| in the manner previously described. The major parts, however, are not welded to or otherwise permanently secured to the body of the reamer.

Instead, they are internally threaded at 22, to

tionoverlying the recesses 5 in much the same manner that the composite ring which overlies the lower auxiliary recesses 4 is disposed with respect together and in the case of the lower ring, welded to those recesses. For the purpose of holding this composite ring in the proper threaded engagement on the body, a set screw 24' is threaded through, the ring and adapted to be tightened into engagement with the body and preferably with one of the recesses 5.

The-reason for making the threaded composite ring of several different parts and welding them.

together instead of making it all in one part is that the body I is customarily formed with an enlargedbell haped portion at its opposite ends Where it is joined to the drill pipe and that if the ring'were made solid, it would be impossible to place it over the body and have it engage the threads 23. i

It will be seen, however, that in the case of each of the rings described, a very strong ring will be'formecl by virtue of the fact that not only are the two major parts of the ring welded along their edges to the body, but in each case there is a second ring Welded about the first ring and having its welded, J'Q nts disposed in ofiset relation to the welded joints of the first ring.

And this second ring serves as a steel band'to prevent the first ring from being split longitudinally. This is strengthened by the fact that the second ring is welded to the first ring along both. of its edges throughout the entire circumference of the rings.

,The reamer cutter which is to be mounted on the reamer body is shown at 25, rotatably mounted upon a pin 26 extending through the major recess 2, and into the respective minor recesses 4 and 5. Welded to the opposite ends of this pin are blocks 27 and 28, respectively. These V blocks are shown welded to the pin at 29 .and 3,0

and are of substantially the same form. The lower block 21, has a-tapered tongue or extension 3i which is adapted to be inserted into one of the recesses beneath the ring which extends thereover and to be wedged within the tapered socket formed in such recess by said ring. The other.

block 28 likewise has a tapered tongue 32, adapted to lie withinthe recess 5 and to receive the ring which is screwed on to the body and overlies the recesses 5. This ring as it is screwed downwardly has an inclined portion 33 adapted to engage the inclined surface of the tongue 32 and urge thesame both longitudinally tourge the ton e 3! into its socket and radially to secure the block 28 firmly within the recess 5.

At the same time this ring will become slightly distorted-by virtue of its engagement at three circumferentially spaced points with the three blocks 28, and due to its inherent resiliency will constantly tend to resumeits' circular shape and will thereby resiliently and continuously urge the.

blocks 21 and 28 into their; seated positions.

Thus, by means of simply rotating the threaded" composite ring referred to, the reamer assembly. may be secured in or released from the reamer body if and when desired. As above stated, this ring may be held against backward or unthread ing movement by means such as the stfscrew 24'.

It will be appreciated that the cutter assembly and. 28, welded to the ends of the pin, isprefendone under expert supervisionso that the reamer 25 may be properly mounted and given the proper clearance to insure free rotation without excessive movement which could lead to vibration. These cutter assemblies are then transported to the field wherethe reamers are then-used in the drilling of wells and when it is found that, a reamer cutter has been worn or otherwise damaged so that its replacement becomesdesirable, it is only necessary to loosen the set screw 24 unscrew the threaded composite ring, remove the old cutter assembly, insert the, new one and tighten the threaded composite ring again, looking it in place with the set screw 24'. Thisis an operation which can be carried on by the use simply of the tongs and rotating equipment customarily employed in the drilling of Wells,-

At the same time, it will be appreciated that a sturdy'and durable mounting for reamer cutters ably assembled in the factory where it can be has been provided and that the fewest possible, 5

number ofparts has been employed. A reamer cutter mounting has thus been provided whichis capable of achieving all of the. objects and invention. j

Having described by invention, I claim: 1. In a reamer construction, a reamer body having a major recess in one side thereof and an producing all of the advantages sought by this auxiliary recess at one end of said major recess,

and a ring around said ,body and extending over said auxiliary recess to form a socket opening to- I ward said major recess, "said ring having an inner surface inclined radially outwardly where 1 it extends over said'auxiliary recess so that said' i socket will taper toward a smaller radial dimension in a direction away from said major recess. 2. In a reamer construction, a reamer body having major recesses at circumferentially spaced j points about its outer surface-and an auxiliary recess at one end of each larger recess, a reamer .cutterin each major recess, a supporting block for supporting each of said cutters and lying in;

said auxiliary recesses respectively, and a resilient ring adapted to be forced into position surrounding said blocks and into engagement with said blocks only,.to slightly distort said ring whereby said ring will serve to resiliently-urge said blocks into said auxiliaryrecess at all times;

3. Ina reamer construction, a reamer body having a major recess in one side thereof and an auxiliary recess at one end of said major re-f cess, a ring around said body and extending over said auxiliary recess to form a socket opening toward said major recess, a reamer cutter adapted to bemounted in said major recess,

means for rotatably mounting said cutter, and a block on one end of said last mentioned means,-,

said block having a tongue thereon adapted to wedgingly engage said socket.

4. In a reamer constructionya reamer body having a major recess in one side thereof, and'an auxiliary recess at one end ofsaid major recess; .15

10 consisting of the cutter 25 pin 26-and blocks 27 25 said flminor parts, and said minor parts being' welded'tosaid major parts throughout their and a ring around said body and extending over saidauxiliary recess, said ring comprising two major semi-circular parts, welded together at their ends. I

5. In a reamer construction, a reamer body having a major recess in one side thereof andan rality of major parts welded together at their ends, and aplurality of minor parts surrounding- I offset c-ircumferentially from the welded ends of.

auxiliary recess at one end of said major recess,

and a ring around said body 'and extending over said auxiliary recess, said ring comprising: a plurality of major parts welded together at their ends, and a plurality of minor parts surrounding said major parts and welded together at their ends, the welded ends of said major parts being ofiset circumferentially from the welded ends of .said minor parts. I I 6. In a reamer construction, a reamer body having a major recess in one side thereof and an auxiliary recess at one end of said major recess,

and a ring around said body and extendingoversaid auxiliary recess, said ring comprising a plusaid major parts'and welded together'at their ends,'the-.welded ends of said major parts being offset circumferentially from the welded ends of length;

7. In .areamer construction, a reamerbody;

having amajor recess in one side thereof and an auxiliary'recess at one end of said major recess, and a ringtaround said body and extending over said auxiliary recess, said ring comprisinga plurality of, major parts welded together at their ends, and a plurality of minor parts surrounding said'major partsand welded together at their ends, theweldedends of said major parts being said. minorparts, and'said minor parts being :count'ersunkinto the ou'ter surface of said major 1 parts to form a continuance of the smooth'outer contour of said major parts,

8. In a reamer construction, a reamer body; having a major recess in one side thereof and an auxiliary recess at one end of said major recess,

of parts welded together at their ends and being countersunk into the surface of said body to form a continuation of the smooth, outer contour of said body. I

9. In areamer construction, a reamer body having a major recess in one side thereof and an auxiliary recess at one end of said major=recess, a ring around said body and extending over said auxiliary recess, said ring comprising a, plurality of parts welded together at their ends and being countersunk into the surface of said body to form a continuation of the smooth'outer contour of said body, and welded to said body throughout its circumference.

10. In a reamer construction, a reamer body 3 a ring-around said body and extending over said auxiliary recess, said ring comprising a plurality having a major recess in one side thereof and an auxiliary recess at one end of said major recess,

and a ring on said body movable longitudinally thereof to a position overlying said auxiliary recess,.said ring consisting of two major semi-circular parts welded together at their ends and two minor semi-circular parts surrounding said major I parts and welded together at their ends, the weld:

ed ends of said major and minor parts being offset circumferentially from each other.

11. In a reamer construction, a reamer body havingv a major recess in one side thereof and a pair of auxiliary recesses at the respective ends ing said body and overlying said auxiliary recesses respectively. I I

v 12. Ina reamer construction, a reamer body having Iarnajor recess in one side thereof and a of said major recess, and a pair of rings surrou'nd- I Y as pain-of auxiliary recesses at the respective ends of-said majorrecess, and a pair of rings surrounding said body and overlying said auxiliary recesses, respectively, one of said ringsbeing move able longitudinally of said body, anda cutter assembly consisting of a reamer cutter and a pair of blocks adapted to'fit into said auxiliary recesses beneath said rings respectively, androtatably carrying said reamer cutter. I

I GEORGE Gr. HARRINGTON. 

